config MN10300_CACHE_MANAGE_BY_TAG
bool "Use the cache tag registers directly"
+ depends on !(SMP && MN10300_CACHE_WTHRU)
config MN10300_CACHE_MANAGE_BY_REG
bool "Flush areas by way of automatic purge registers (AM34 only)"
# Makefile for the MN10300-specific memory management code
#
+cache-smp-wback-$(CONFIG_MN10300_CACHE_WBACK) := cache-smp-flush.o
+
cacheflush-y := cache.o
+cacheflush-$(CONFIG_SMP) += cache-smp.o cache-smp-inv.o $(cache-smp-wback-y)
cacheflush-$(CONFIG_MN10300_CACHE_INV_ICACHE) += cache-inv-icache.o
cacheflush-$(CONFIG_MN10300_CACHE_FLUSH_ICACHE) += cache-flush-icache.o
cacheflush-$(CONFIG_MN10300_CACHE_INV_BY_TAG) += cache-inv-by-tag.o
#include <linux/module.h>
#include <linux/mm.h>
#include <asm/cacheflush.h>
+#include <asm/smp.h>
+#include "cache-smp.h"
+
/**
* flush_icache_page - Flush a page from the dcache and invalidate the icache
* @vma: The VMA the page is part of.
void flush_icache_page(struct vm_area_struct *vma, struct page *page)
{
unsigned long start = page_to_phys(page);
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+
+ mn10300_local_dcache_flush_page(start);
+ mn10300_local_icache_inv_page(start);
- mn10300_dcache_flush_page(start);
- mn10300_icache_inv_page(start);
+ smp_cache_call(SMP_IDCACHE_INV_FLUSH_RANGE, start, start + PAGE_SIZE);
+ smp_unlock_cache(flags);
}
EXPORT_SYMBOL(flush_icache_page);
/* flush the dcache and invalidate the icache coverage on that
* region */
- mn10300_dcache_flush_range2(addr + off, size);
- mn10300_icache_inv_range2(addr + off, size);
+ mn10300_local_dcache_flush_range2(addr + off, size);
+ mn10300_local_icache_inv_range2(addr + off, size);
+ smp_cache_call(SMP_IDCACHE_INV_FLUSH_RANGE, start, end);
}
/**
void flush_icache_range(unsigned long start, unsigned long end)
{
unsigned long start_page, end_page;
+ unsigned long flags;
+
+ flags = smp_lock_cache();
if (end > 0x80000000UL) {
/* addresses above 0xa0000000 do not go through the cache */
if (end > 0xa0000000UL) {
end = 0xa0000000UL;
if (start >= end)
- return;
+ goto done;
}
/* kernel addresses between 0x80000000 and 0x9fffffff do not
* require page tables, so we just map such addresses
* directly */
start_page = (start >= 0x80000000UL) ? start : 0x80000000UL;
- mn10300_dcache_flush_range(start_page, end);
- mn10300_icache_inv_range(start_page, end);
+ mn10300_local_dcache_flush_range(start_page, end);
+ mn10300_local_icache_inv_range(start_page, end);
+ smp_cache_call(SMP_IDCACHE_INV_FLUSH_RANGE, start_page, end);
if (start_page == start)
- return;
+ goto done;
end = start_page;
}
start_page = start & PAGE_MASK;
- end_page = end & PAGE_MASK;
+ end_page = (end - 1) & PAGE_MASK;
if (start_page == end_page) {
/* the first and last bytes are on the same page */
/* more than 2 pages; just flush the entire cache */
mn10300_dcache_flush();
mn10300_icache_inv();
+ smp_cache_call(SMP_IDCACHE_INV_FLUSH, 0, 0);
}
+
+done:
+ smp_unlock_cache(flags);
}
EXPORT_SYMBOL(flush_icache_range);
#include <linux/module.h>
#include <linux/mm.h>
#include <asm/cacheflush.h>
+#include <asm/smp.h>
+#include "cache-smp.h"
/**
* flush_icache_page_range - Flush dcache and invalidate icache for part of a
addr = page_to_phys(page);
/* invalidate the icache coverage on that region */
- mn10300_icache_inv_range2(addr + off, size);
+ mn10300_local_icache_inv_range2(addr + off, size);
+ smp_cache_call(SMP_ICACHE_INV_FLUSH_RANGE, start, end);
}
/**
void flush_icache_range(unsigned long start, unsigned long end)
{
unsigned long start_page, end_page;
+ unsigned long flags;
+
+ flags = smp_lock_cache();
if (end > 0x80000000UL) {
/* addresses above 0xa0000000 do not go through the cache */
if (end > 0xa0000000UL) {
end = 0xa0000000UL;
if (start >= end)
- return;
+ goto done;
}
/* kernel addresses between 0x80000000 and 0x9fffffff do not
* require page tables, so we just map such addresses
* directly */
start_page = (start >= 0x80000000UL) ? start : 0x80000000UL;
- mn10300_dcache_flush_range(start_page, end);
mn10300_icache_inv_range(start_page, end);
+ smp_cache_call(SMP_ICACHE_INV_FLUSH_RANGE, start, end);
if (start_page == start)
- return;
+ goto done;
end = start_page;
}
start_page = start & PAGE_MASK;
- end_page = end & PAGE_MASK;
+ end_page = (end - 1) & PAGE_MASK;
if (start_page == end_page) {
/* the first and last bytes are on the same page */
flush_icache_page_range(end_page, end);
} else {
/* more than 2 pages; just flush the entire cache */
- mn10300_icache_inv();
+ mn10300_local_icache_inv();
+ smp_cache_call(SMP_ICACHE_INV, 0, 0);
}
+
+done:
+ smp_unlock_cache(flags);
}
EXPORT_SYMBOL(flush_icache_range);
--- /dev/null
+/* Functions for global dcache flush when writeback caching in SMP
+ *
+ * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/mm.h>
+#include <asm/cacheflush.h>
+#include "cache-smp.h"
+
+/**
+ * mn10300_dcache_flush - Globally flush data cache
+ *
+ * Flush the data cache on all CPUs.
+ */
+void mn10300_dcache_flush(void)
+{
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+ mn10300_local_dcache_flush();
+ smp_cache_call(SMP_DCACHE_FLUSH, 0, 0);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_page - Globally flush a page of data cache
+ * @start: The address of the page of memory to be flushed.
+ *
+ * Flush a range of addresses in the data cache on all CPUs covering
+ * the page that includes the given address.
+ */
+void mn10300_dcache_flush_page(unsigned long start)
+{
+ unsigned long flags;
+
+ start &= ~(PAGE_SIZE-1);
+
+ flags = smp_lock_cache();
+ mn10300_local_dcache_flush_page(start);
+ smp_cache_call(SMP_DCACHE_FLUSH_RANGE, start, start + PAGE_SIZE);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_range - Globally flush range of data cache
+ * @start: The start address of the region to be flushed.
+ * @end: The end address of the region to be flushed.
+ *
+ * Flush a range of addresses in the data cache on all CPUs, between start and
+ * end-1 inclusive.
+ */
+void mn10300_dcache_flush_range(unsigned long start, unsigned long end)
+{
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+ mn10300_local_dcache_flush_range(start, end);
+ smp_cache_call(SMP_DCACHE_FLUSH_RANGE, start, end);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_range2 - Globally flush range of data cache
+ * @start: The start address of the region to be flushed.
+ * @size: The size of the region to be flushed.
+ *
+ * Flush a range of addresses in the data cache on all CPUs, between start and
+ * start+size-1 inclusive.
+ */
+void mn10300_dcache_flush_range2(unsigned long start, unsigned long size)
+{
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+ mn10300_local_dcache_flush_range2(start, size);
+ smp_cache_call(SMP_DCACHE_FLUSH_RANGE, start, start + size);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_inv - Globally flush and invalidate data cache
+ *
+ * Flush and invalidate the data cache on all CPUs.
+ */
+void mn10300_dcache_flush_inv(void)
+{
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+ mn10300_local_dcache_flush_inv();
+ smp_cache_call(SMP_DCACHE_FLUSH_INV, 0, 0);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_inv_page - Globally flush and invalidate a page of data
+ * cache
+ * @start: The address of the page of memory to be flushed and invalidated.
+ *
+ * Flush and invalidate a range of addresses in the data cache on all CPUs
+ * covering the page that includes the given address.
+ */
+void mn10300_dcache_flush_inv_page(unsigned long start)
+{
+ unsigned long flags;
+
+ start &= ~(PAGE_SIZE-1);
+
+ flags = smp_lock_cache();
+ mn10300_local_dcache_flush_inv_page(start);
+ smp_cache_call(SMP_DCACHE_FLUSH_INV_RANGE, start, start + PAGE_SIZE);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_inv_range - Globally flush and invalidate range of data
+ * cache
+ * @start: The start address of the region to be flushed and invalidated.
+ * @end: The end address of the region to be flushed and invalidated.
+ *
+ * Flush and invalidate a range of addresses in the data cache on all CPUs,
+ * between start and end-1 inclusive.
+ */
+void mn10300_dcache_flush_inv_range(unsigned long start, unsigned long end)
+{
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+ mn10300_local_dcache_flush_inv_range(start, end);
+ smp_cache_call(SMP_DCACHE_FLUSH_INV_RANGE, start, end);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_flush_inv_range2 - Globally flush and invalidate range of data
+ * cache
+ * @start: The start address of the region to be flushed and invalidated.
+ * @size: The size of the region to be flushed and invalidated.
+ *
+ * Flush and invalidate a range of addresses in the data cache on all CPUs,
+ * between start and start+size-1 inclusive.
+ */
+void mn10300_dcache_flush_inv_range2(unsigned long start, unsigned long size)
+{
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+ mn10300_local_dcache_flush_inv_range2(start, size);
+ smp_cache_call(SMP_DCACHE_FLUSH_INV_RANGE, start, start + size);
+ smp_unlock_cache(flags);
+}
--- /dev/null
+/* Functions for global i/dcache invalidation when caching in SMP
+ *
+ * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/mm.h>
+#include <asm/cacheflush.h>
+#include "cache-smp.h"
+
+/**
+ * mn10300_icache_inv - Globally invalidate instruction cache
+ *
+ * Invalidate the instruction cache on all CPUs.
+ */
+void mn10300_icache_inv(void)
+{
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+ mn10300_local_icache_inv();
+ smp_cache_call(SMP_ICACHE_INV, 0, 0);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_icache_inv_page - Globally invalidate a page of instruction cache
+ * @start: The address of the page of memory to be invalidated.
+ *
+ * Invalidate a range of addresses in the instruction cache on all CPUs
+ * covering the page that includes the given address.
+ */
+void mn10300_icache_inv_page(unsigned long start)
+{
+ unsigned long flags;
+
+ start &= ~(PAGE_SIZE-1);
+
+ flags = smp_lock_cache();
+ mn10300_local_icache_inv_page(start);
+ smp_cache_call(SMP_ICACHE_INV_RANGE, start, start + PAGE_SIZE);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_icache_inv_range - Globally invalidate range of instruction cache
+ * @start: The start address of the region to be invalidated.
+ * @end: The end address of the region to be invalidated.
+ *
+ * Invalidate a range of addresses in the instruction cache on all CPUs,
+ * between start and end-1 inclusive.
+ */
+void mn10300_icache_inv_range(unsigned long start, unsigned long end)
+{
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+ mn10300_local_icache_inv_range(start, end);
+ smp_cache_call(SMP_ICACHE_INV_RANGE, start, end);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_icache_inv_range2 - Globally invalidate range of instruction cache
+ * @start: The start address of the region to be invalidated.
+ * @size: The size of the region to be invalidated.
+ *
+ * Invalidate a range of addresses in the instruction cache on all CPUs,
+ * between start and start+size-1 inclusive.
+ */
+void mn10300_icache_inv_range2(unsigned long start, unsigned long size)
+{
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+ mn10300_local_icache_inv_range2(start, size);
+ smp_cache_call(SMP_ICACHE_INV_RANGE, start, start + size);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_inv - Globally invalidate data cache
+ *
+ * Invalidate the data cache on all CPUs.
+ */
+void mn10300_dcache_inv(void)
+{
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+ mn10300_local_dcache_inv();
+ smp_cache_call(SMP_DCACHE_INV, 0, 0);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_inv_page - Globally invalidate a page of data cache
+ * @start: The address of the page of memory to be invalidated.
+ *
+ * Invalidate a range of addresses in the data cache on all CPUs covering the
+ * page that includes the given address.
+ */
+void mn10300_dcache_inv_page(unsigned long start)
+{
+ unsigned long flags;
+
+ start &= ~(PAGE_SIZE-1);
+
+ flags = smp_lock_cache();
+ mn10300_local_dcache_inv_page(start);
+ smp_cache_call(SMP_DCACHE_INV_RANGE, start, start + PAGE_SIZE);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_inv_range - Globally invalidate range of data cache
+ * @start: The start address of the region to be invalidated.
+ * @end: The end address of the region to be invalidated.
+ *
+ * Invalidate a range of addresses in the data cache on all CPUs, between start
+ * and end-1 inclusive.
+ */
+void mn10300_dcache_inv_range(unsigned long start, unsigned long end)
+{
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+ mn10300_local_dcache_inv_range(start, end);
+ smp_cache_call(SMP_DCACHE_INV_RANGE, start, end);
+ smp_unlock_cache(flags);
+}
+
+/**
+ * mn10300_dcache_inv_range2 - Globally invalidate range of data cache
+ * @start: The start address of the region to be invalidated.
+ * @size: The size of the region to be invalidated.
+ *
+ * Invalidate a range of addresses in the data cache on all CPUs, between start
+ * and start+size-1 inclusive.
+ */
+void mn10300_dcache_inv_range2(unsigned long start, unsigned long size)
+{
+ unsigned long flags;
+
+ flags = smp_lock_cache();
+ mn10300_local_dcache_inv_range2(start, size);
+ smp_cache_call(SMP_DCACHE_INV_RANGE, start, start + size);
+ smp_unlock_cache(flags);
+}
--- /dev/null
+/* SMP global caching code
+ *
+ * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/threads.h>
+#include <linux/interrupt.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/cacheflush.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/smp.h>
+#include "cache-smp.h"
+
+DEFINE_SPINLOCK(smp_cache_lock);
+static unsigned long smp_cache_mask;
+static unsigned long smp_cache_start;
+static unsigned long smp_cache_end;
+static cpumask_t smp_cache_ipi_map; /* Bitmask of cache IPI done CPUs */
+
+/**
+ * smp_cache_interrupt - Handle IPI request to flush caches.
+ *
+ * Handle a request delivered by IPI to flush the current CPU's
+ * caches. The parameters are stored in smp_cache_*.
+ */
+void smp_cache_interrupt(void)
+{
+ unsigned long opr_mask = smp_cache_mask;
+
+ switch ((enum smp_dcache_ops)(opr_mask & SMP_DCACHE_OP_MASK)) {
+ case SMP_DCACHE_NOP:
+ break;
+ case SMP_DCACHE_INV:
+ mn10300_local_dcache_inv();
+ break;
+ case SMP_DCACHE_INV_RANGE:
+ mn10300_local_dcache_inv_range(smp_cache_start, smp_cache_end);
+ break;
+ case SMP_DCACHE_FLUSH:
+ mn10300_local_dcache_flush();
+ break;
+ case SMP_DCACHE_FLUSH_RANGE:
+ mn10300_local_dcache_flush_range(smp_cache_start,
+ smp_cache_end);
+ break;
+ case SMP_DCACHE_FLUSH_INV:
+ mn10300_local_dcache_flush_inv();
+ break;
+ case SMP_DCACHE_FLUSH_INV_RANGE:
+ mn10300_local_dcache_flush_inv_range(smp_cache_start,
+ smp_cache_end);
+ break;
+ }
+
+ switch ((enum smp_icache_ops)(opr_mask & SMP_ICACHE_OP_MASK)) {
+ case SMP_ICACHE_NOP:
+ break;
+ case SMP_ICACHE_INV:
+ mn10300_local_icache_inv();
+ break;
+ case SMP_ICACHE_INV_RANGE:
+ mn10300_local_icache_inv_range(smp_cache_start, smp_cache_end);
+ break;
+ }
+
+ cpu_clear(smp_processor_id(), smp_cache_ipi_map);
+}
+
+/**
+ * smp_cache_call - Issue an IPI to request the other CPUs flush caches
+ * @opr_mask: Cache operation flags
+ * @start: Start address of request
+ * @end: End address of request
+ *
+ * Send cache flush IPI to other CPUs. This invokes smp_cache_interrupt()
+ * above on those other CPUs and then waits for them to finish.
+ *
+ * The caller must hold smp_cache_lock.
+ */
+void smp_cache_call(unsigned long opr_mask,
+ unsigned long start, unsigned long end)
+{
+ smp_cache_mask = opr_mask;
+ smp_cache_start = start;
+ smp_cache_end = end;
+ smp_cache_ipi_map = cpu_online_map;
+ cpu_clear(smp_processor_id(), smp_cache_ipi_map);
+
+ send_IPI_allbutself(FLUSH_CACHE_IPI);
+
+ while (!cpus_empty(smp_cache_ipi_map))
+ /* nothing. lockup detection does not belong here */
+ mb();
+}
--- /dev/null
+/* SMP caching definitions
+ *
+ * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+
+/*
+ * Operation requests for smp_cache_call().
+ *
+ * One of smp_icache_ops and one of smp_dcache_ops can be OR'd together.
+ */
+enum smp_icache_ops {
+ SMP_ICACHE_NOP = 0x0000,
+ SMP_ICACHE_INV = 0x0001,
+ SMP_ICACHE_INV_RANGE = 0x0002,
+};
+#define SMP_ICACHE_OP_MASK 0x0003
+
+enum smp_dcache_ops {
+ SMP_DCACHE_NOP = 0x0000,
+ SMP_DCACHE_INV = 0x0004,
+ SMP_DCACHE_INV_RANGE = 0x0008,
+ SMP_DCACHE_FLUSH = 0x000c,
+ SMP_DCACHE_FLUSH_RANGE = 0x0010,
+ SMP_DCACHE_FLUSH_INV = 0x0014,
+ SMP_DCACHE_FLUSH_INV_RANGE = 0x0018,
+};
+#define SMP_DCACHE_OP_MASK 0x001c
+
+#define SMP_IDCACHE_INV_FLUSH (SMP_ICACHE_INV | SMP_DCACHE_FLUSH)
+#define SMP_IDCACHE_INV_FLUSH_RANGE (SMP_ICACHE_INV_RANGE | SMP_DCACHE_FLUSH_RANGE)
+
+/*
+ * cache-smp.c
+ */
+#ifdef CONFIG_SMP
+extern spinlock_t smp_cache_lock;
+
+extern void smp_cache_call(unsigned long opr_mask,
+ unsigned long addr, unsigned long end);
+
+static inline unsigned long smp_lock_cache(void)
+ __acquires(&smp_cache_lock)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&smp_cache_lock, flags);
+ return flags;
+}
+
+static inline void smp_unlock_cache(unsigned long flags)
+ __releases(&smp_cache_lock)
+{
+ spin_unlock_irqrestore(&smp_cache_lock, flags);
+}
+
+#else
+static inline unsigned long smp_lock_cache(void) { return 0; }
+static inline void smp_unlock_cache(unsigned long flags) {}
+static inline void smp_cache_call(unsigned long opr_mask,
+ unsigned long addr, unsigned long end)
+{
+}
+#endif /* CONFIG_SMP */
#include <asm/cacheflush.h>
#include <asm/io.h>
#include <asm/uaccess.h>
+#include <asm/smp.h>
+#include "cache-smp.h"
EXPORT_SYMBOL(mn10300_icache_inv);
+EXPORT_SYMBOL(mn10300_icache_inv_range);
+EXPORT_SYMBOL(mn10300_icache_inv_range2);
+EXPORT_SYMBOL(mn10300_icache_inv_page);
EXPORT_SYMBOL(mn10300_dcache_inv);
EXPORT_SYMBOL(mn10300_dcache_inv_range);
EXPORT_SYMBOL(mn10300_dcache_inv_range2);
projects / linux-beck.git / commitdiff